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SECTION 3
TROUBLESHOOTING
SECTION
3
describes the methods of trouble-
shooting.
3-2
refers to several errors specified
in a system level.
3-3
describes normal ope-
rations
and
the
check
points
for
abnormal
operations.
These descriptions define the Error
Spot under op crating conditions.
3-1 BEFORE TROUBLESHOOTING
The following proc edures are recommended to
see if the drive is really faulty or not:
a. Incorrec t operational procedure
b. program error of host system
c. Poor connection with host system
(esp.
GND-related connec tion, frame
GND,
etc.)
d. Defective
disk.
Check
that
same
trouble
occurs with other disks.
e. Environmental
conditions
(where
electrical
noise easily jumps into signal)
f. Influenc e of strong magnetic field
g. Wrong supply voltage
h. Wrong drive selection
3-2 TYPES OF ERROR ON A SYSTEM LEVEL
3-2-1 Soft
Euor
Soft error are caused by:
a. Dir ty head
b. Electrical noise
c. Tracking error
d. Poor connection with system
(GND-related connection)
e. Incorrect motor speed
f. Incorrect head compliance
Clean the head first by cleaning disk.
Check
for index pulse interval and head compliance and
then read error spot more than several times.
If
not readable, move the head to the adjacent
track in the same direction as before, then
return
to
the desired
track,
and read.
If
readable
this
time,
check
radial
alignment.
(Refer to 5-1)
If not readable yet, the error is
not recoverable.
3-2-2 Write Brror
To determine which of the disk or the drive
fails the disk should be replaced by other disks
and check that there still exist. write error.
If
write error does not exist any more, remove
the old one.
If write error exists with use of
any disk, drive might cause write error.
3-2-3 Seek Euoe
Seek error comes from:
a. Head movement is incorrect because electri-
cal noise jumps into signal.
b. Head driving system might be at fault.
If
it is not readable after re-calibration, drive
might be at fault.
3-2-4
Interchange Error
If
data written on one drive is readable cor-
recdy
on
another drive,
but not by other
drives, interchange error exists.
Interchange errors are caused by:
a. Head is not properly positioned.
b. Motor speed is not correct.
c. Optimum head output level, offset and head
compliance are not obtained.
d. Chucking mechanism does not work.
3-3 FAULT
DIAGNOSIS
BY
MFD
FUNCTION
CHECKE R II
3-3-1
describes
check
method
for
normal
operations
in
accordance
with
the
prede-
termined procedures.
3-3-2
describes
check
points
for
abnormal
operations which come out in accordance with
the above procedures.
-18-
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